JPH03107609A - Split bearing self-alined by inclined face - Google Patents

Abstract

PURPOSE:To avoid an alignment error in the radial direction in assembling a bearing body and a bearing cap by forming mating faces of the bearing body and the bearing cap as inclined surfaces with respect to a center line parallel with the fastening direction. CONSTITUTION:Bottom end faces of a bearing body 1 are formed so as to be symmetric inclined surfaces 8 with respect to a symmetry axis C parallel with a center line of bolt holes 1a. In addition, upper end faces of a bearing cap 3 are formed so as to be symmetric inclined surfaces 9 with respect to an axis C'. In this case, these inclined surfaces 8 and 9 have an equal inclination angle for their accurate fitting, and serve as guide surfaces so that the axes of symmetry C and C' coincide when the inclined surfaces 8 and 9 are engaged closely. Consequently, it is possible by this simple constitution to avoid an alignment error and seizure due to the error.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a half-split bearing, and more particularly to a half-split bearing with inclined surface positioning suitable for use in a large end of a connecting rod of an engine.

[Prior Art] Conventionally, in a half-split type bearing for the large end of a connecting rod in an engine, as shown in Figs. It is implanted in a tight fit state by being press-fitted into the hole 1a.

The bolt 2 is loosely inserted into the bolt hole 3a of the bearing cap 3 and tightened from below with a nut 4, and the bearing cap 3 is clamped and fixed by the nut 4 and the bearing body 1.

Furthermore, after this clamping and fixing, finishing machining of the large end hole 5 is performed, and the large end hole 5 is formed of two different members, the rod side end 1 and the bearing cap 3, and has a continuous peripheral edge. It can be installed smoothly with a

[Problems to be Solved by the Invention] By the way, in such a conventional half-side bearing, the bearing cap 3 is tightened and fixed with the nut 4, and after finishing the large end hole 5, it is first disassembled. Then, the bearing metal 6a
, 6b are installed on the shaft 7.

At this time, since the bolt 2 is loosely inserted into the bolt hole 3a of the bearing cap 3, there is a possibility that the bearing cap 3 will be assembled in a state shifted laterally (in the radial direction of the shaft) with respect to the initially assembled state. At this time, the portion of the large end hole 5 from the rod side end portion 1 to the bearing cap 3 is in a step-like discontinuous state.

Therefore, as shown in FIG. 4, the mating surfaces of the bearing metal 6a and the bearing metal 6b also engage in a stepped manner.
There is a problem in that the edges of the bearing metals 6a, 6b and the shaft (crankbin) 7 come into metal contact, resulting in a lack of oil film and the possibility of seizure.

The present invention was made in view of these problems.

The object of the present invention is to provide a half-split type bearing with inclined surface positioning, which can prevent positional displacement during reassembly of the rod side end of the connecting rod (bearing body) and the bearing cap.

[Means for Solving the Problems] Therefore, the inclined surface positioning half-split type bearing of the present invention includes a bearing body and a bearing cap fixed to the bearing body in the half-split type bearing. , in order to avoid radial displacement when the bearing body and the bearing cap are fixed, the mating surfaces of the bearing body and the bearing cap are
It is characterized in that it is formed in an inclined surface that is inclined with respect to the axial center line along the tightening direction of the bearing body and the bearing cap.

[Function] In the inclined surface positioning half-split type bearing of the present invention described above, when assembling the bearing cap to the bearing body, the mating surfaces of the bearing body and the bearing cap engage, but the second mating surface engages with the bearing body. Since it is inclined with respect to the axial center line along the tightening direction of the bearing body and the bearing cap, the relative position of the bearing body and the bearing cap in the radial direction is adjusted as the bearing body and the bearing cap are tightened. Thereby, the bearing body and the bearing cap are assembled in a predetermined positional relationship.

[Example] Hereinafter, a tilted surface positioning half-split type bearing as an example of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a main part schematically showing its structure.

As shown in FIG. 1, similarly to the conventional example (see FIGS. 2 to 4), a bolt 2 (not shown in FIG. 1) is installed in the rod side end 1, and a bearing cap 3 The bolt 2 is loosely inserted into the bolt hole 3a of the bearing cap 3 with the nut 4.
However, the tightening is fixed.

In this embodiment, the lower end surface of the bearing body 1 is.

It is formed with an inclined surface 8 that is symmetrical with respect to an axis of symmetry C that extends along the axial center line of the bolt hole 1a.

Further, the upper end surface of the bearing cap 3 is aligned with the axis of symmetry C'
The inclined surface 9 is line-symmetrical with respect to the inclined surface 8 and is formed with the same slope and in close contact with the inclined surface 8.

Further, the inclined surfaces 8.9 are configured as guide surfaces that mutually guide each other so that when they are closely engaged, the symmetry axes C and C' coincide, forming mating surfaces line-symmetrical with respect to the same symmetry axis. be done)

Since the inclined surface positioning half-split type bearing of the present invention is constructed as described above, before finishing the large end hole 5, the bearing cap 3 is tightened with the bolt 2 and nut 4 as shown in FIG. It will be done.

At this time, the left and right bolts 2 and nuts 4 are equally tightened with a constant torque using a torque wrench, and the bearing cap 3 is fixed to the bearing body 1 so that a constant tightening force F1 is generated. As a result, the force Xx2 in the surface direction acting between the inclined surface 9 of the bearing cap 3 and the inclined surface 8 of the rod side end 1 also acts equally, and the double-ended inclined surfaces 8, 9 are moved in the lateral direction ( The radial direction of the shaft 7) is positioned so that the axis of symmetry C of the inclined surface 8 and the axis of symmetry C' of the inclined surface 9 are coaxial.

Then, in this state, finishing machining of the large end hole 5 is performed.

Furthermore, when it is disassembled and assembled to the shaft (crankbin) 7, the bearing metals 6a and 6b (see Fig. 4) are attached to the shaft 7.
The bearing cap 3 is assembled from below by loosely inserting the bolt 2 into the bolt hole 3a.

After that, the nut 4 is screwed onto the bolt 2 and tightened. At this time, in the same way as described above, the left and right bolts 2 and nuts 4 are tightened with an even and constant tightening force F1, and the bearing cap 3 is tightened using a torque wrench. is fixed to the bearing body 1.

As a result, the sloped surface 9 of the bearing cap 3 is guided by the sloped surface 8 of the rod side end 1, and finally the sloped surfaces 8.9 are in close contact with each other at a certain position, and the sloped surface 8 is symmetrical. The axis C and the axis of symmetry C' of the inclined surface 9 come to coincide.

As a result, the rod side end 1 and the bearing cap 3 are assembled in the same positional relationship as when the large end hole 5 was initially finished, and the large end hole 5 is assembled with a continuous and smooth periphery. It will be done.

Note that the inclined surfaces 8 and 9 do not necessarily have to be symmetrical, and the tightening force of the left and right bolts 2 and nuts 4 may be set depending on the shapes of the inclined surfaces 8 and 9.

Further, each of the inclined surfaces 8 and 9 may be a curved surface that matches each other.

[Effects of the Invention] As detailed above, according to the inclined surface positioning half-split bearing of the present invention, the half-split bearing includes a bearing body and a bearing cap fixed to the bearing body, and In order to avoid radial misalignment when the bearing body and the bearing cap are fixed, the mating surface of the bearing body and the bearing cap is aligned with the axis line along the tightening direction of the bearing body and the bearing cap. The bearing body and the bearing cap can always be assembled in the same positional relationship due to the extremely simple structure formed on the sloped surface, which prevents seizure caused by misalignment of the bearing body. There are advantages to becoming like this.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the main parts schematically showing the structure of a half-split type bearing for tilted surface positioning as an embodiment of the present invention, and FIGS. 2 to 4 show conventional half-split type bearings. , FIG. 2 is a schematic front view of the connecting rod equipped with the connecting rod, FIG. 3 is a front view showing a main part thereof cut away, and FIG. 4 is a cross-sectional view showing a portion around the shaft thereof. 1- Rod side end as bearing body, 2- Bolt, 3-
Bearing cap, 4-nut, 5-big end hole. 6a, 6b - bearing metal, 7 - shaft (crank pin) 8.
9- Sloped surface.

Claims (1)

[Claims] The half-split type bearing includes a bearing body and a bearing cap fixed to the bearing body, and the bearing body and the bearing cap are fixed to each other in order to avoid radial displacement when the bearing body and the bearing cap are fixed. 1. An inclined surface positioning type half-split bearing, characterized in that a mating surface thereof is formed as an inclined surface inclined with respect to an axial center line along a direction in which the bearing body and the bearing cap are tightened.